Transformer for electric-arc cutting and welding apparatus



Oct. 4, 1927. 4 1,644,604 F. C. OWEN TRANSFORMER FOR ELECTRIC ARC CUTTING AND WELDING APPARATUS Filed Nov.19, 1925 Patented Oct. 4, 1927.

UNITED STATES PATENT DFFICE.

FREDERICK C. OWEN, OF FAYETTEVILLE, NORTH CAROLINA.

Application led November 19, 1925. Serial No. 70,083.

. This invention relates to alternating current electric arc cutting and welding apparat-us and more particularlyto single phase transformers for such apparatus.

The invention has for one of its ob]ects to im rove and simplify the -general construction of transformers of the character stated and to provide transformers that shall beso wound and constructed as to obviate the necessity of the use of fans orl other mechanical cooling means and the use of flux diverters, damping devices or manually operated resistances and reactances for regulating the current and otential in the l5 primary and secondary win ings.

With the foregoing and other objects 1n view, the invention consists of the novel construction, combination and arrangement of parts hereinafterl fully described and claimed, and illustrated in the accompanying drawing, wherein:

Figure 1 is a dia ammatic view of an alternating current e ectric arc cutting and welding apparatus embodying a transformer constructed in accordance with my mvention Figure 2 is a similar view illustrating a sliglhtly modified form of the transformer, an

Figures 3, 4 and 5 are similar views illustrating further modified forms of the transformer.

Corresponding'and like parts are referred to in the following description, and designated in all the figuresof the drawing, by

similar reference c aracters.

Referring in detail to the drawing, and

more particularly to Figure 1, 1 designates the core which is of laminated constructionV and embodies a top leg 2, bottom leg 3, side legs 4, and middle leg 5.

The primary win ing ofthe transformer comprises a section consisting of coils 6, 7 and 8 connectedin series and mounted on the legs 2, 3 and 4 at one side ofthe le 5, and a section consistin of coils 9, 10 an 11 connected in series an mounted on the legs 2,3 and 4 at the opposite side of the le 5. The sections are connected in paralle by wires 12 and 13.

The secondary winding of the transformer comprises a single coil 14 mounted on Vthe leg 5 and provided with taps 15. One end of this coil is connected by a lead 16 to the. work 17 which is to be cut, welded or repaired, and any one of the taps 15 is adapted to be connected by a lead 18 to the cutting, repair or welding electrode 19.

n Figure 2 is shown a slightly modified form of the transformer. This transformer is adapted to permit two cutting, welding or repair operations to be performed at the same time. The core and primary Winding of this transformer are similar to the corresponding parts of the transformer shown in Fi re 1. v It has, however, two secondary windin s each embodying a main or voltage regulating coil 20 mounted on the leg 3 and an auxiliary or current regulating coil 21 mounted on the le 2 and connected in series by awire 22. e coils 20 are connected to the work 17 b leads 16. The coils 21 are each provid with taps 23 any one of which is adapted to be connected to the electrode 19 by a lead 18. If desired the secondary windings of this transformer may be connected in parallel or series to adapt the ap aratns for performing a single cutting, we ding or re air operation.

The core an primary winding of the trans? former shown in Figure 3 are similar vto the corresponding parts of the transformers shown in Figures 1 and 2. The secondary winding is, however, different and comprises main or voltage regulating coils 24 mounted on the legs 4 and an auxiliary or current regulating coil 25 mounted on the le 5. These coils may be connected in paralle or in series, as shown in the drawing, and the coil 25 is provided with taps 26 any one of which may be connected to the electrode 19 by a lead 18", and one of the coils 24 is connected to the work 17 by a lead 16".

A further modified form of the transformer is shown in Figure 4. This transformer embodies a core yand primary winding similar to the correspgonding parts of the transformers shown in i res 1, 2 and 3. The seconder windi of t is transformer differs from t e secon` ary windings of said other transformers, and comprises ,a section consisting of main or voltage regulating coils 2? and 28 mounts@ om h@ legs 2 @ml 3fm; @ma

and a seguan @mais @mmm regaining @mi 38 .mm -f g Tls@ mis am conmed in ses? and wh@ @0M 3S is pmvded Wih raps 3L, @ne @15 which is adapted i@ be smiles@ 1 i h@ ecmd@ by a had E85; This is cmmecd iz@ the work i? by a W 12.8%

each uramsfmrmera the @me p1-@vides a pumty of compeley dnssea magneti@ p Q3 th@ primary winding sacenm distrbum abowme gfelf @rfmyoi @ash said pmhs, am sqawnumfy Wndwcf i dsafuf about bath ci sai Y Y Cwfm: ws hmubh the psi a cmsan: main @Nwe and a .ma-M3 sec @n-.ary votirg@ WM be mduce. im ich@ secondiary Winding: The eficicn bef'wfem fakes@ voltages is such ihm; zhee is immcedi im@ seconary circuit including the Work and @leef-zwei@ iight @mmm at fload @m6, a hevy cufrem; at heavy had, with th@ NSEM Mlm; a stable :are of high owe? mm." may be readily maintained dumng wfe'fhea; vertcl horizontallcuttng? weding 0r n@ pairing of steel? Wougf; imm., cast iron, masab imms aumimums brass, bmmfa; cap pef and any mma-:mls: Fumhemnm? them@ is im@ from spuztermg and, spfntmg, ami ift has been fum that a sked @psmm @im maintain sm mrc Within @ne and. Cent plus; m minus of @im mfg/3d capaci@ me the tap with whisk the @ecmd is cmnected. What is claimed isz L- A transfmmf comprising a om@ pm vdi'ng a pumlity of dosed magmic mills, a 'rmarywndng embodying saacftiomsl dis trlgmted amund he gram@ pmim each Wind wmprsng smm? secscms di. ized mmm@ said wpa, hmmm and, SM@- mddkeg? and @me hav com hav# :L semmdmy distributed around the md@ and awo 0f the oher legs of the com.,

8 A mmsfmmer comprising a core having mp7 botms sid@ and middle legs, a primary Winding distibued abnuz zhe top, hozmm and side legs only b@ care", and. a secndary winding having coils mi the top md bczom ieg@ 0f th@ cora 9 A mnfmmer compsing a, com having imp? bfcsm, side and midde lega5f a. rimay Winding dlisfiibuted about the wp, 0- fwm :and sid@ lega only of the core7 and a secondmy Wminw on. th@ core :md having 9L pomgion therwf cosey associated with the primary Winding and a prtion remote from th@ pimary Winding..

10. A transformer comprising a om@ pro# vding a. puwifzy of dosed magnetic, pathss. primary Winding smmdying secitms ditributed about a portion of each of said paths tributed around a portion of each of said and connected in parallel, and a secondary paths,` each section comprising coils conwinding distributed around'a plurality of nec-ted in series and the sections being con- 10 said paths. nected in (parallel, and a secondary7 wlnding 5 11. y A transformer comprising a core prodistribute around a plurality of said paths. viding a plurality of closed magnetic paths, In testimony whereof I alx my signature. a primary winding embodying sections dis- FREDERICK C. OWEN. 

